Joint



(No Model.) I M. G. CRANE.

Joint.

Na, 242,513. if Patented June 7,1881.

Wi ESEEE. I Irv/211L31 g iib gfiw W *6 W W1- FFIC.

MOSES G. CRANE, OF NEWTON, MASSACHUSETTS.

JOINT.

SPECIFICATION formingpart of Letters Patent No, 242,513, dated June '7, 1881.

Application filed December 29, 1850. (No model.)

To all whom tt may concern I Be it known that I, MOSES G. CRANE, of Newton, county of Middlesex, and State of Massachusetts, have invented an Improvement in Joints, of which the following description, in connection with the accompanying drawings, is a specification.

This invention relates to joints for woodwork, and has reference to that class ofjoints denominated blind joints, the object of said invention being the production of a perfectly blind joint, or, in other words, to so construct a joint that it will have a true surface on either of its sides or edges.

The invention consists in providing eachportion of the said joint with mortises and tenons, each extending through from surface to surface of the material, thereby giving it the strength of an ordinary mortise-joint, and so cutting or producing said mortises and tenons that when placed together to form a joint they will be invisible, which is of very great importance in the manufacture ot wood-work, especially cabinet -\vork, wherein a perfectly blind and finished mortisejoint is desirable.

This my improved joint, in consequence of the arrangement of the mortises and tenons, can be used to great advantage in various branches of carpentry, and in the manufacture or construction of various articles where parts are to be connected byjoints.

Figure 1. represents, in perspective, two pieces of wood provided with mortises and tenons and joined in accordance with my invention; and Fig. 2, alike view of one of said pieces detached, to show the mortises and tenons.

in this my invention the block or piece of wood a, constitu ing one half or portion ofthe joint, is provided with a series of tenons, I), each tenon being arranged at a suitable distance from the one next to it, and preferably so shaped that their peripheries will form an arc of a circle, the length of saidarc being more or less, according to the desired angle of the joint to be formed, and with intervening correspondingly-shaped mortises or recesses for the reception of like tenons on the block or other portion d, the peripheries of the tenons, shaped as described, when in position to complete the joint, forming a lenticular configuration, as designated in full and dotted lines at c, Fig. 1. The said tenons and mortises come to a sharp termination at the outer and inner surfaces of their respective blocks, a (I, thereby leaving a perfectly straight and sharp edge at the extreme points, where the two blocks meet, thereby forming a blind joint.

It is obvious that the tenons and mortises may be of different shape from that herein shown and described without departii'lg from the spirit of my invention, the essential feature of which consists in so shaping the said tenons and mortises as to bring them to a sharp point or termination at the outer and inner points of the angles, as before described.

As shown in the drawings, each curved edge 2 of the tenons, when the two pieces are joined together, takes a bearing against the curved seat or shoulder 3 of the mortise. I

Glue added to this joint holds it securely, and said joint may be made very strong, because of the extent of the surfaces brought in contact.

The form herein shown, consisting of mortises and tenons, may be readily formed by a gang of circular saws whose circumference corresponds to the arc of the mortise, the curved edge of the tenons being cut by bringing it on a' turn-table against the edge of a gig-saw.

I claim- 1. The herein-described joint, composed of the mortised and tenoned portions to d, the said mortises and tenons therein extending from the outer to the inner surfaces of their respective portions, or coming to a sharp termination at these points, whereby perfectly straight and sharp edges are left at the extreme points of juncture of the portions (0 d, alarge extent of joining-surface secured, and a perfectly blind joint obtained, suhstantially'as described.

2. In an angle-joint, the lenticular-shaped tenons with intervening mortises, adapted to be fitted together, substantially as and for the purpose described.

In testimony whereot'I have signed my name to this specification in the presence of two subscribing witnesses.

MOSES G. CRANE.

Witnesses EDWIN ROGERS, J 0s. 1?. LIVERMORE. 

